Geologic Map of Arigma This map of the state by Darton and others will soon be out. It is a great advance in our know- lodge. All of Arigma west and south of a line joining King Hills, Pichaco, Sacaton, Mesa, Canon, Prescott, Stradberry and Gold Basin, is as far as known all of Archeogic schist and granite, Older (Cutaneous) and younger volcanics (Pleistocene), and Bolson deposits (Pliocene but mainly Pleistocene). Associated with schists in many places in western Arigma are diomatic matters that Darton holds are Cadiniferas, because he says in one place he saw a crinoid columnal. Lawson rather thinks they are instead Archeogic strata. Again Darton says a large piece of limestone with Coral fossils that is said came from over the Colorado river in Cal. a little south west of Cibola, Arigma. As far as my paleographic maps so they lend support to the idea that all of Arigma may have been deeply covered by Carbon-Permian strata. If this is true then much of the granite I met Arigma must be Jurassic age. Such granites can be seen from western Arigma into California. The age of the matters must be determined, since it is a big factor in coming out the age of the volcanics.